• publisher: Washington, D.C. : National Park Service, U.S. Dept. of the Interior : For sale by Supt. of Docs., U.S. Govt. Print. Office
  • creator: Perry, Bill, 1918- United States. National Park Service
  • contributor: United States. National Park Service.
  • Keyword: Zoology Yellowstone National Park.
  • years: 1972.
  • pages: 32 p. :
  • notes: Cover title.
  • download: pdf file